#include <REGX52.H>
void Delay1ms(unsigned int xms)	//@12.000MHz
{
	while(xms)
	{
		unsigned char data i, j;

	i = 12;
	j = 169;
	do
	{
		while (--j);
	} while (--i);
		xms--;
	}
}

void main()
{
	while(1)
	{
		P2=0xFE;  //1111 1110
		Delay1ms(500);
		P2=0xFD;  //1111 1101
		Delay1ms(500);
		P2=0xFB;  //1111 1011
		Delay1ms(500);
		P2=0xF7;  //1111 0111
		Delay1ms(500);
		P2=0xEF;  //1110 1111
		Delay1ms(500);
		P2=0xDF;  //1101 1111
		Delay1ms(500);
		P2=0xBF;  //1011 1111
		Delay1ms(500);
		P2=0x7F;  //0111 1111
		Delay1ms(500);
		

	}
}
